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Document and Entity Information - shares	6 Months Ended
Document and Entity Information - shares	Jun. 30, 2012	Aug. 03, 2012
Entity Information [Line Items]
Entity Registrant Name	NATURAL GAS SERVICES GROUP INC
Entity Central Index Key	0001084991
Current Fiscal Year End Date	--12-31
Entity Filer Category	Accelerated Filer
Document Type	10-Q
Document Period End Date	Jun. 30, 2012
Document Fiscal Year Focus	2012
Document Fiscal Period Focus	Q2
Amendment Flag	false
Entity Common Stock, Shares Outstanding		12,316,499

Condensed Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2012	Dec. 31, 2011
Current Assets:
Cash and cash equivalents	$ 30,472	$ 16,390
Trade accounts receivable, net of allowance for doubtful accounts of $462 and $296, respectively	4,609	5,679
Inventory, net of allowance for obsolescence of $771 and $486, respectively	26,729	26,965
Prepaid income taxes	109	109
Prepaid expenses and other	519	360
Total current assets	62,438	49,503
Rental equipment, net of accumulated depreciation of $62,967 and $56,623, respectively	141,664	142,473
Property and equipment, net of accumulated depreciation of $8,463 and $7,786, respectively	7,445	7,839
Goodwill, net of accumulated amortization of $325, both periods	10,039	10,039
Intangibles, net of accumulated amortization of $1,967 and $1,936, respectively	2,219	2,282
Other assets	28	28
Total assets	223,833	212,164
Current Liabilities:
Accounts payable	2,094	3,730
Accrued liabilities	5,638	3,644
Current income tax liability	119	75
Deferred income	4,953	4,863
Total current liabilities	12,804	12,312
Line of credit, noncurrent portion	1,017	1,017
Deferred income tax liability	40,673	36,769
Other long-term liabilities	513	524
Total liabilities	55,007	50,622
Commitments and Contingencies
Stockholders’ Equity:
Preferred stock, 5,000 shares authorized, no shares issued or outstanding	0	0
Common stock, 30,000 shares authorized, par value $0.01; 12,218 and 12,179 shares issued and outstanding, respectively	122	122
Additional paid-in capital	88,001	87,225
Retained earnings	80,703	74,195
Total stockholders' equity	168,826	161,542
Total liabilities and stockholders' equity	$ 223,833	$ 212,164

Condensed Balance Sheets Parentheticals - USD ($) shares in Thousands	Jun. 30, 2012	Dec. 31, 2011
Current Assets:
Allowance for doubtful accounts	$ 462,000	$ 296,000
Allowance for inventory obsolescence	770,808	485,680
Assets, Noncurrent [Abstract]
Accumulated depreciation, rental equipment	62,967,000	56,623,000
Accumulated depreciation, property and equipment	8,463,000	7,786,000
Accumulated amortization, goodwill	325,000	325,000
Accumulated amortization, intangibles	$ 1,967,000	$ 1,936,000
Stockholders' Equity Attributable to Parent [Abstract]
Preferred stock, shares authorized	5,000	5,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	30,000	30,000
Common stock, shares issued	12,218	12,179
Common stock, shares outstanding	12,218	12,179

Condensed Income Statements - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Revenue:
Sales, net	$ 10,649	$ 1,901	$ 23,080	$ 5,778
Rental income	13,671	11,601	27,409	22,482
Service and maintenance income	188	256	395	552
Total revenue	24,508	13,758	50,884	28,812
Operating costs and expenses:
Cost of sales, exclusive of depreciation stated separately below	7,563	638	17,118	3,186
Cost of rentals, exclusive of depreciation stated separately below	5,874	4,909	11,383	9,271
Cost of service and maintenance, exclusive of depreciation stated separately below	98	93	191	231
Selling, general, and administrative expense	2,347	1,462	4,157	2,848
Depreciation and amortization	3,797	3,434	7,584	6,725
Total operating costs and expenses	19,679	10,536	40,433	22,261
Operating income	4,829	3,222	10,451	6,551
Other income (expense):
Interest expense	(3)	(28)	(5)	(37)
Other income	61	45	99	753
Total other income	58	17	94	716
Income before provision for income taxes	4,887	3,239	10,545	7,267
Provision for income taxes	1,887	1,231	4,037	2,762
Net income	$ 3,000	$ 2,008	$ 6,508	$ 4,505
Earnings per share:
Basic	$ 0.25	$ 0.16	$ 0.53	$ 0.37
Diluted	$ 0.24	$ 0.16	$ 0.53	$ 0.37
Weighted average shares outstanding:
Basic	12,216	12,179	12,177	12,157
Diluted	12,316	12,288	12,274	12,265

Condensed Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
Condensed Statements of Cash Flows - USD ($) $ in Thousands	Jun. 30, 2012	Jun. 30, 2011
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 6,508	$ 4,505
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	7,584	6,725
Deferred taxes	3,937	2,649
Stock options and restricted stock expense	686	450
Gain on disposal of assets	0	(702)
Changes in current assets and liabilities:
Trade accounts receivables, net	1,070	499
Inventory, net	236	(1,265)
Prepaid income taxes and prepaid expenses	(159)	1,755
Accounts payable and accrued liabilities	358	256
Current income tax liability	44	29
Deferred income	90	1,126
NET CASH PROVIDED BY OPERATING ACTIVITIES	20,354	16,027
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchase of property and equipment	(6,319)	(19,481)
Proceeds from sale of property and equipment	0	980
NET CASH USED IN INVESTING ACTIVITIES	(6,319)	(18,501)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from other long-term liabilities, net	(10)	0
Proceeds from exercise of stock options	57	198
NET CASH PROVIDED BY (USED IN) FINANCING ACTIVITIES	47	198
NET CHANGE IN CASH AND CASH EQUIVALENTS	14,082	(2,276)
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD	16,390	19,137
CASH AND CASH EQUIVALENTS AT END OF PERIOD	30,472	16,861
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION:
Interest paid	6	$ 43
Income taxes paid	1
NON-CASH TRANSACTIONS
Transfer of rental equipment to inventory	$ 8,690

Basis of Presentation and Summary of Significant Accounting Policies	6 Months Ended
	Jun. 30, 2012
Accounting Policies [Abstract]
Basis of Presentation and Significant Accounting Policies	Basis of Presentation and Summary of Significant Accounting Policies These notes apply to the unaudited condensed financial statements of Natural Gas Services Group, Inc. (the "Company", “NGSG”, "Natural Gas Services Group", "we" or "our") (a Colorado corporation). We were formed on December 17, 1998 for the purposes of combining the operations of certain manufacturing, service and leasing entities. The accompanying unaudited condensed financial statements present the results of our Company taken from our books and records. In our opinion, such information includes all adjustments, consisting of only normal recurring adjustments, which are necessary to make our financial position at June 30, 2012 and the results of our operations for the three and six months ended 2012 and 2011 not misleading. As permitted by the rules and regulations of the Securities and Exchange Commission (SEC), the accompanying condensed financial statements do not include all disclosures normally required by accounting principles generally accepted in the United States of America (GAAP). These financial statements should be read in conjunction with the financial statements included in our Annual Report on Form 10-K for the year ended December 31, 2011 on file with the SEC. In our opinion, the condensed financial statements are a fair presentation of the financial position, results of operations and cash flows for the periods presented. The results of operations for the three and six months ended June 30, 2012 are not necessarily indicative of the results of operations to be expected for the full fiscal year ending December 31, 2012. Revenue recognition Revenue from the sales of custom and fabricated compressors, and flare systems is recognized upon shipment of the equipment to customers or when all conditions have been met or title is transferred to the customer. Exchange and rebuild compressor revenue is recognized when both the replacement compressor has been delivered and the rebuild assessment has been completed. Revenue from compressor services is recognized upon providing services to the customer. Maintenance agreement revenue is recognized as services are rendered. Rental revenue is recognized over the terms of the respective rental agreements based upon the classification of the rental agreement. Deferred income represents payments received before a product is shipped. Revenue from the sale of rental units is included in sales revenue when equipment is shipped or title is transferred to the customer. Fair Value of Financial Instruments Our financial instruments consist principally of cash and cash equivalents, accounts receivable, accounts payable and our line of credit. Pursuant to ASC 820 (Accounting Standards Codification), the fair value of our cash equivalents is determined based on “Level 1” inputs, which consist of quoted prices in active markets for identical assets. We believe that the recorded values of all of our other financial instruments approximate their current fair values because of their nature and respective relatively short maturity dates or durations. Recently Issued Accounting Pronouncements In September 2011, FASB issued ASU 2011-08, Testing Goodwill for Impairment. Under the amendments in this Update, an entity has the option to first assess qualitative factors to determine whether the existence of events or circumstances leads to a determination that it is more likely than not that the fair value of a reporting unit is less than its carrying amount. If, after assessing the totality of events or circumstances, an entity determines it is not more likely than not that the fair value of a reporting unit is less than its carrying amount, then performing the two-step impairment test is unnecessary. However, if an entity concludes otherwise, then it is required to perform the first step of the two-step impairment test by calculating the fair value of the reporting unit and comparing the fair value with the carrying amount of the reporting unit. If the carrying amount of a reporting unit exceeds its fair value, then the entity is required to perform the second step of the goodwill impairment test to measure the amount of the impairment loss, if any. Under the amendments in this Update, an entity has the option to bypass the qualitative assessment for any reporting unit in any period and proceed directly to performing the first step of the two-step goodwill impairment test. An entity may resume performing the qualitative assessment in any subsequent period. The adoption of ASU No. 2011-08 on January 8, 2012 did not and is not expected to have a material effect on our financial position or results of operations.

Stock-Based Compensation

6 Months Ended

Jun. 30, 2012

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Disclosure of Compensation Related Costs, Share-based Payments

Stock-Based Compensation

Stock Options:

A summary of option activity under our 1998 Stock Option plan for the six months ended June 30, 2012 is presented below.



	Number of Stock Options		Weighted Average Exercise Price		Weighted Average Remaining Contractual Life (years)	Aggregate Intrinsic Value (in thousands)
Outstanding, December 31, 2011	422,239		$	15.06	6.48	$	766
Granted	20,000		14.89		8.00
Exercised	(7,500	)	7.66		—
Canceled/Forfeited	—		—		—
Outstanding, June 30, 2012	434,739		$	15.18	6.10	$	770
Exercisable, June 30, 2012	366,072		$	14.81	5.66	$	770

We granted options to purchase 20,000 shares to our non-executive employees on January 25, 2012 at an exercise price of $14.89 with a three year vesting period.

The following table summarizes information about our stock options outstanding at June 30, 2012:



Range of Exercise Prices	Options Outstanding				Options Exercisable
Range of Exercise Prices	Shares	Weighted Average Remaining Contractual Life (years)	Weighted Average Exercise Price		Shares	Weighted Average Exercise Price
0.01 – 5.58	5,000	1.00	$	4.72	5,000	$	4.72
5.59 – 9.43	89,239	4.41	8.62		89,239	8.62
9.44 – 15.60	85,000	6.32	12.94		65,000	12.34
15.61 – 20.48	255,500	6.71	18.42		206,833	18.50
0.01 – 20.48	434,739	6.10	$	15.18	366,072	$	14.81

The summary of the status of our unvested stock options as of December 31, 2011 and changes during the six months ended June 30, 2012 is presented below.



Unvested stock options:	Shares			Weighted Average Grant Date Fair Value
Unvested at December 31, 2011	78,666			$	8.82
Granted	20,000		14.89	14.89
Vested	(29,999	)		7.99
Unvested at June 30, 2012	68,667			$	10.95

As of June 30, 2012, there was $474,715 of unrecognized compensation cost related to unvested options. Such cost is expected to be recognized over a weighted-average period of 1.77 years. Total compensation expense for stock options was $214,083 and $234,150 for the six months ended June 30, 2012 and 2011, respectively.

Restricted Stock:

On January 25, 2012, the Compensation Committee awarded 70,000 shares of restricted common stock to our three named executive officers. 30,000 of the restricted shares were awarded to Stephen C. Taylor, our Chief Executive Officer, pursuant to the terms of his employment agreement. We also awarded Mr. Taylor an additional 20,000 restricted shares and our other two named executive officers 10,000 restricted shares each in connection with our review of their performance in 2011. The restricted shares issued to Messrs. Hazlett and Lawrence vest in annual one-third installments beginning on January 25, 2013, with Mr. Taylor's restricted shares subject to a one year vesting requirement. On March 28, 2012, we awarded and issued 12,500 shares of restricted stock to our Board of Directors as part payment for 2012 Directors' fees. The restricted stock vests in quarterly installments beginning on March 31, 2013. Total compensation expense related to restricted stock awards was $471,629 and $215,868 for the six months ended June 30, 2012 and 2011, respectively. As of June 30, 2012, there was a total of $953,385 of unrecognized compensation expenses related to these shares of restricted stock.

- Definition

The entire disclosure for compensation-related costs for equity-based compensation, which may include disclosure of policies, compensation plan details, allocation of equity compensation, incentive distributions, equity-based arrangements to obtain goods and services, deferred compensation arrangements, employee stock ownership plan details and employee stock purchase plan details.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 50
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6406099&loc=d3e25284-112666

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 40
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6418621&loc=d3e17540-113929

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5444-113901

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 14

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 123R
-Paragraph 64, 65, A240
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Statement of Position (SOP)
-Number 93-6
-Paragraph 53
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Inventory

6 Months Ended

Jun. 30, 2012

Inventory Disclosure [Abstract]

Inventory Disclosure [Text Block]

Inventory

Our inventory, net of allowance for obsolescence of $770,808 at June 30, 2012 and $485,680 at December 31, 2011, consisted of the following amounts:



	June 30, 2012		December 31, 2011
	(in thousands)
Raw materials	$	19,108	$	20,364
Work in process	7,621		6,601
	$	26,729	$	26,965

During the six months ended June 30, 2012 and June 30, 2011, there was zero write off of obsolete inventory against the allowance for obsolescence.

Credit Facility	6 Months Ended
Credit Facility	Jun. 30, 2012
Debt Disclosure [Abstract]
Credit Facility	Credit Facility On December 31, 2010, we established a $20 million senior secured revolving credit agreement (subject to a right, on an uncommitted basis, to increase the commitments thereunder to up to $40 million) with JP Morgan Chase Bank, N.A. On December 31, 2011, we amended and renewed the Credit Agreement, which was set to expire on December 31, 2011 (the "Amended Credit Agreement"). The Amended Credit Agreement increased our aggregate commitment amount from $20 million to $30 million, subject to collateral availability. We also have a right to request from the lender, on an uncommitted basis, an increase of up to $20 million on the aggregate commitment (which could potentially increase the commitment amount to $50 million). The maturity date was extended to December 31, 2014, and the interest rate terms were amended. Borrowing Base. At any time before the maturity of the Amended Credit Agreement, we may draw, repay and re-borrow amounts available under the borrowing base up to the maximum aggregate availability discussed above. Generally, the borrowing base equals the sum of (a) 80% of our eligible accounts receivable plus (b) 50% of the book value of our eligible general inventory (not to exceed 50% of the commitment amount at the time) plus (c) 75% of the book value of our eligible equipment inventory. JPMorgan Chase Bank (the “Lender”) may adjust the borrowing base components if material deviations in the collateral are discovered in future audits of the collateral. We had $28.9 million borrowing base availability at June 30, 2012 under the terms of our Amended Credit Agreement. Interest and Fees. Under the terms of the Amended Credit Agreement, we have the option of selecting the applicable variable rate for each revolving loan, or portion thereof, of either (a) LIBOR multiplied by the Statutory Reserve Rate (as defined in the Amended Credit Agreement), with respect to this rate, for Eurocurrency funding, plus the Applicable Margin (“LIBOR-based”), or (b) CB Floating Rate, which is the Lender's Prime Rate less the Applicable Margin; provided, however, that no more than three LIBOR-based borrowings under the agreement may be outstanding at any one time. For purposes of the LIBOR-based interest rate, the Applicable Margin is 1.50%. For purposes of the CB Floating Rate, the Applicable Margin is 1.25%. For the six month period ended June 30, 2012, our weighted average interest rate was 1.8%. Accrued interest is payable monthly on outstanding principal amounts, provided that accrued interest on LIBOR-based loans is payable at the end of each interest period, but in no event less frequently than quarterly. In addition, fees and expenses are payable in connection with our requests for letters of credit (generally equal to the Applicable Margin for LIBOR-related borrowings multiplied by the face amount of the requested letter of credit) and administrative and legal costs. Maturity . The maturity date of the Amended Credit Agreement is December 31, 2014, at which time all amounts borrowed under the agreement will be due and outstanding letters of credit must be cash collateralized. The agreement may be terminated early upon our request or the occurrence of an event of default. Security. The obligations under the Amended Credit Agreement are secured by a first priority lien on all of our inventory and accounts and leases receivables, along with a first priority lien on a variable number of our leased compressor equipment the book value of must be maintained at a minimum of 2.00 to 1.00 commitment coverage ration (such ratio being equal to (i) the amount of the borrowing base as of such date to (ii) the amount of the commitment as of such date.) Covenants. The Amended Credit Agreement contains customary representations and warranties, as well as covenants which, among other things, limit our ability to incur additional indebtedness and liens; enter into transactions with affiliates; make acquisitions in excess of certain amounts; pay dividends; redeem or repurchase capital stock or senior notes; make investments or loans; make negative pledges; consolidate, merge or effect asset sales; or change the nature of our business. In addition, we also have certain financial covenants that require us to maintain on a consolidated basis a leverage ratio less than or equal to 2.50 to 1.00 as of the last day of each fiscal quarter. Events of Default and Acceleration. The Amended Credit Agreement contains customary events of default for credit facilities of this size and type, and includes, without limitation, payment defaults; defaults in performance of covenants or other agreements contained in the loan documents; inaccuracies in representations and warranties; certain defaults, termination events or similar events; certain defaults with respect to any other Company indebtedness in excess of $50,000; certain bankruptcy or insolvency events; the rendering of certain judgments in excess of $150,000; certain ERISA events; certain change in control events and the defectiveness of any liens under the secured revolving credit facility. Obligations under the Amended Credit Agreement may be accelerated upon the occurrence of an event of default. As of June 30, 2012, we were in compliance with all covenants in our Amended Credit Agreement. A default under our Credit Agreement could trigger the acceleration of our bank debt so that it is immediately due and payable. Such default would likely limit our ability to access other credit. At June 30, 2012 our balance on the line of credit was $1.0 million.

- Definition

The entire disclosure for information about short-term and long-term debt arrangements, which includes amounts of borrowings under each line of credit, note payable, commercial paper issue, bonds indenture, debenture issue, own-share lending arrangements and any other contractual agreement to repay funds, and about the underlying arrangements, rationale for a classification as long-term, including repayment terms, interest rates, collateral provided, restrictions on use of assets and activities, whether or not in compliance with debt covenants, and other matters important to users of the financial statements, such as the effects of refinancing and noncompliance with debt covenants.

+ References + Details

Other Long-term Liabilities	6 Months Ended
Other Long-term Liabilities	Jun. 30, 2012
Other Liabilities Disclosure [Abstract]
Other Long-term Liabilities	Other Long-term Liabilities As of June 30, 2012, we had a long-term liability of $275,000 to Midland Development Corporation. This amount is to be recognized as income contingent upon certain staffing requirements in the future. In addition, we entered into a purchase agreement with a vendor on July 30, 2008 pursuant to which we agreed to purchase up to $4.8 million of our paint and coating requirements exclusively from the vendor. In connection with the execution of the agreement, the vendor paid us a $300,000 fee which is considered to be a discount toward future purchases from the vendor. The $300,000 payment we received is recorded as a long-term liability and will decrease as the purchase commitment is fulfilled. The long-term liability remaining as of June 30, 2012 was $238,084.

Earnings per Share

6 Months Ended

Jun. 30, 2012

Earnings Per Share [Abstract]

Earnings per Share

The following table reconciles the numerators and denominators of the basic and diluted earnings per share computation.



	Three months ended				Six months ended
	June 30,				June 30,
	(in thousands, except per share data)				(in thousands, except per share data)
	2012		2011		2012		2011
Numerator:
Net income	$	3,000	$	2,008	$	6,508	$	4,505
Denominator for basic net income per common share:
Weighted average common shares outstanding	12,216		12,179		12,177		12,157

Denominator for diluted net income per share:
Weighted average common shares outstanding	12,216		12,179		12,177		12,157
Dilutive effect of stock options and restricted stock	100		109		97		108
Diluted weighted average shares	12,316		12,288		12,274		12,265
Earnings per common share:
Basic	$	0.25	$	0.16	$	0.53	$	0.37
Diluted	$	0.24	$	0.16	$	0.53	$	0.37

For the six months ended June 30, 2012, there were no stock options excluded due to their anti-dilutive effect. A total of 59,680 stock options for the six months ended June 30, 2011 were excluded from the diluted weighted average shares as their effect would be anti-dilutive.

Segment Information

6 Months Ended

Jun. 30, 2012

Segment Reporting [Abstract]

Segment Information

ASC 280-10-50, Operating Segments, define the characteristics of an operating segment as a) being engaged in business activity from which it may earn revenue and incur expenses, b) being reviewed by the company's chief operating decision maker (CODM) for decisions about resources to be allocated and assess its performance and c) having discrete financial information. Although we indeed look at our product line information to analyze the nature of our revenue, other financial information, such as certain costs and expenses, net income and EBITDA are not captured or analyzed by these categories. Therefore discrete financial information is not available by product line and our CODM does not make resource allocation decisions or assess the performance of the business based on these categories, but rather in the aggregate. Based on this, Management believes that it operates in one business segment.

However, should a portion of our business be considered an operating segment; management has additionally reviewed the criteria for aggregation. ASC 280-10-50-11, Aggregation Criteria, allows for the aggregation of operating segments if the segments have similar economic characteristics and if the segments are similar in each of the following areas:


•	The nature of the products and services;


•	The nature of the production of processes;


•	The type or class of customer for their products and services;


•	The methods used to distribute their products or provide their services; and


•	The nature of the regulatory environment, if applicable.

We are engaged in the business of designing and manufacturing compressors and flares. Our compressors and flares are sold and rented to our customers. In addition, we provide service and maintenance on compressors in our fleet and to third parties.These business activities are similar in all geographic areas. Our manufacturing process is essentially the same for the entire Company and is performed in house at our facilities in Midland, Texas and Tulsa, Oklahoma. Our customers primarily consist of entities in the business of producing natural gas. The maintenance and service of our products is consistent across the entire Company and is performed via an internal fleet of vehicles. The regulatory environment is similar in every jurisdiction in that the most impacting regulations and practices are the result of federal energy policy. In addition, the economic characteristics of each customer arrangement are similar in that we maintain policies at the corporate level.

Therefore, we believe that should product lines be considered separate operating segments, they meet the requirements for aggregation as described above.



For the three months ended June 30, 2012 (in thousands):
	Sales		Rental		Service & Maintenance		Corporate			Total
Revenue	$	10,649	$	13,671	$	188	$	—		$	24,508
Operating costs and expenses	7,563		5,874		98		6,144			19,679
Other income (expense)	—		—		—		58			58
Income before provision for income taxes	$	3,086	$	7,797	$	90	$	(6,086	)	$	4,887



For the three months ended June 30, 2011 (in thousands):
	Sales		Rental		Service & Maintenance		Corporate			Total
Revenue	$	1,901	$	11,601	$	256	$	—		$	13,758
Operating costs and expenses	638		4,909		93		4,896			10,536
Other income (expense)	—		—		—		17			17
Income before provision for income taxes	$	1,263	$	6,692	$	163	$	(4,879	)	$	3,239



For the six months ended June 30, 2012 (in thousands):
	Sales		Rental		Service & Maintenance		Corporate			Total
Revenue	$	23,080	$	27,409	$	395	$	—		$	50,884
Operating costs and expenses	17,118		11,383		191		11,741			40,433
Other income (expense)	—		—		—		94			94
Income before provision for income taxes	$	5,962	$	16,026	$	204	$	(11,647	)	$	10,545



For the six months ended June 30, 2011 (in thousands):
	Sales		Rental		Service & Maintenance		Corporate			Total
Revenue	$	5,778	$	22,482	$	552	$	—		$	28,812
Operating costs and expenses	3,186		9,271		231		9,573			22,261
Other income (expense)	—		—		—		716			716
Income before provision for income taxes	$	2,592	$	13,211	$	321	$	(8,857	)	$	7,267

- Definition

The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 34
-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8981-108599

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 41
-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e9038-108599

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8971-108599

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8595-108599

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8380-108599

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 32
-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8933-108599

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 26
-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8844-108599

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 35
-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8984-108599

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 40
-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e9031-108599

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 42
-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e9054-108599

Reference 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8538-108599

Reference 12: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 29
-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8864-108599

Reference 13: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 31
-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8924-108599

Reference 14: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 30
-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8906-108599

Reference 15: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 131
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Commitments and Contingencies	6 Months Ended
Commitments and Contingencies	Jun. 30, 2012
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies From time to time, we are a party to various legal proceedings in the ordinary course of our business. While management is unable to predict the ultimate outcome of these actions, it believes that any ultimate liability arising from these actions will not have a material adverse effect on our financial position, results of operations or cash flow. We are not currently a party to any material legal proceedings, and we are not aware of any other threatened litigation.

Basis of Presentation and Summary of Significant Accounting Policies (Policies)	6 Months Ended
	Jun. 30, 2012
Accounting Policies [Abstract]
Revenue Recognition, Policy [Policy Text Block]	Revenue recognition Revenue from the sales of custom and fabricated compressors, and flare systems is recognized upon shipment of the equipment to customers or when all conditions have been met or title is transferred to the customer. Exchange and rebuild compressor revenue is recognized when both the replacement compressor has been delivered and the rebuild assessment has been completed. Revenue from compressor services is recognized upon providing services to the customer. Maintenance agreement revenue is recognized as services are rendered. Rental revenue is recognized over the terms of the respective rental agreements based upon the classification of the rental agreement. Deferred income represents payments received before a product is shipped. Revenue from the sale of rental units is included in sales revenue when equipment is shipped or title is transferred to the customer.
Fair Value of Financial Instruments, Policy [Policy Text Block]	Fair Value of Financial Instruments Our financial instruments consist principally of cash and cash equivalents, accounts receivable, accounts payable and our line of credit. Pursuant to ASC 820 (Accounting Standards Codification), the fair value of our cash equivalents is determined based on “Level 1” inputs, which consist of quoted prices in active markets for identical assets. We believe that the recorded values of all of our other financial instruments approximate their current fair values because of their nature and respective relatively short maturity dates or durations.
New Accounting Pronouncements, Policy [Policy Text Block]	In September 2011, FASB issued ASU 2011-08, Testing Goodwill for Impairment. Under the amendments in this Update, an entity has the option to first assess qualitative factors to determine whether the existence of events or circumstances leads to a determination that it is more likely than not that the fair value of a reporting unit is less than its carrying amount. If, after assessing the totality of events or circumstances, an entity determines it is not more likely than not that the fair value of a reporting unit is less than its carrying amount, then performing the two-step impairment test is unnecessary. However, if an entity concludes otherwise, then it is required to perform the first step of the two-step impairment test by calculating the fair value of the reporting unit and comparing the fair value with the carrying amount of the reporting unit. If the carrying amount of a reporting unit exceeds its fair value, then the entity is required to perform the second step of the goodwill impairment test to measure the amount of the impairment loss, if any. Under the amendments in this Update, an entity has the option to bypass the qualitative assessment for any reporting unit in any period and proceed directly to performing the first step of the two-step goodwill impairment test. An entity may resume performing the qualitative assessment in any subsequent period. The adoption of ASU No. 2011-08 on January 8, 2012 did not and is not expected to have a material effect on our financial position or results of operations.

- Definition

Disclosure of accounting policy for revenue recognition. If the entity has different policies for different types of revenue transactions, the policy for each material type of transaction is generally disclosed. If a sales transaction has multiple element arrangements (for example, delivery of multiple products, services or the rights to use assets) the disclosure may indicate the accounting policy for each unit of accounting as well as how units of accounting are determined and valued. The disclosure may encompass important judgment as to appropriateness of principles related to recognition of revenue. The disclosure also may indicate the entity's treatment of any unearned or deferred revenue that arises from the transaction.

+ References + Details

Stock-Based Compensation (Tables)

6 Months Ended

Jun. 30, 2012

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]

A summary of option activity under our 1998 Stock Option plan for the six months ended June 30, 2012 is presented below.



	Number of Stock Options		Weighted Average Exercise Price		Weighted Average Remaining Contractual Life (years)	Aggregate Intrinsic Value (in thousands)
Outstanding, December 31, 2011	422,239		$	15.06	6.48	$	766
Granted	20,000		14.89		8.00
Exercised	(7,500	)	7.66		—
Canceled/Forfeited	—		—		—
Outstanding, June 30, 2012	434,739		$	15.18	6.10	$	770
Exercisable, June 30, 2012	366,072		$	14.81	5.66	$	770

Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block]

The following table summarizes information about our stock options outstanding at June 30, 2012:



Range of Exercise Prices	Options Outstanding				Options Exercisable
Range of Exercise Prices	Shares	Weighted Average Remaining Contractual Life (years)	Weighted Average Exercise Price		Shares	Weighted Average Exercise Price
0.01 – 5.58	5,000	1.00	$	4.72	5,000	$	4.72
5.59 – 9.43	89,239	4.41	8.62		89,239	8.62
9.44 – 15.60	85,000	6.32	12.94		65,000	12.34
15.61 – 20.48	255,500	6.71	18.42		206,833	18.50
0.01 – 20.48	434,739	6.10	$	15.18	366,072	$	14.81

Schedule of Stock Options Roll Forward [Table Text Block]

he summary of the status of our unvested stock options as of December 31, 2011 and changes during the six months ended June 30, 2012 is presented below.



Unvested stock options:	Shares			Weighted Average Grant Date Fair Value
Unvested at December 31, 2011	78,666			$	8.82
Granted	20,000		14.89	14.89
Vested	(29,999	)		7.99
Unvested at June 30, 2012	68,667			$	10.95

Inventory (Tables)

6 Months Ended

Jun. 30, 2012

Inventory Disclosure [Abstract]

Schedule of Inventory, Current [Table Text Block]

Our inventory, net of allowance for obsolescence of $770,808 at June 30, 2012 and $485,680 at December 31, 2011, consisted of the following amounts:



	June 30, 2012		December 31, 2011
	(in thousands)
Raw materials	$	19,108	$	20,364
Work in process	7,621		6,601
	$	26,729	$	26,965

Earnings per Share (Tables)

6 Months Ended

Jun. 30, 2012

Earnings Per Share [Abstract]

Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]

The following table reconciles the numerators and denominators of the basic and diluted earnings per share computation.



	Three months ended				Six months ended
	June 30,				June 30,
	(in thousands, except per share data)				(in thousands, except per share data)
	2012		2011		2012		2011
Numerator:
Net income	$	3,000	$	2,008	$	6,508	$	4,505
Denominator for basic net income per common share:
Weighted average common shares outstanding	12,216		12,179		12,177		12,157

Denominator for diluted net income per share:
Weighted average common shares outstanding	12,216		12,179		12,177		12,157
Dilutive effect of stock options and restricted stock	100		109		97		108
Diluted weighted average shares	12,316		12,288		12,274		12,265
Earnings per common share:
Basic	$	0.25	$	0.16	$	0.53	$	0.37
Diluted	$	0.24	$	0.16	$	0.53	$	0.37

Segment Information (Tables)

6 Months Ended

Jun. 30, 2012

Segment Reporting [Abstract]

Schedule of Segment Reporting Information, by Segment [Table Text Block]



For the three months ended June 30, 2012 (in thousands):
	Sales		Rental		Service & Maintenance		Corporate			Total
Revenue	$	10,649	$	13,671	$	188	$	—		$	24,508
Operating costs and expenses	7,563		5,874		98		6,144			19,679
Other income (expense)	—		—		—		58			58
Income before provision for income taxes	$	3,086	$	7,797	$	90	$	(6,086	)	$	4,887



For the three months ended June 30, 2011 (in thousands):
	Sales		Rental		Service & Maintenance		Corporate			Total
Revenue	$	1,901	$	11,601	$	256	$	—		$	13,758
Operating costs and expenses	638		4,909		93		4,896			10,536
Other income (expense)	—		—		—		17			17
Income before provision for income taxes	$	1,263	$	6,692	$	163	$	(4,879	)	$	3,239



For the six months ended June 30, 2012 (in thousands):
	Sales		Rental		Service & Maintenance		Corporate			Total
Revenue	$	23,080	$	27,409	$	395	$	—		$	50,884
Operating costs and expenses	17,118		11,383		191		11,741			40,433
Other income (expense)	—		—		—		94			94
Income before provision for income taxes	$	5,962	$	16,026	$	204	$	(11,647	)	$	10,545



For the six months ended June 30, 2011 (in thousands):
	Sales		Rental		Service & Maintenance		Corporate			Total
Revenue	$	5,778	$	22,482	$	552	$	—		$	28,812
Operating costs and expenses	3,186		9,271		231		9,573			22,261
Other income (expense)	—		—		—		716			716
Income before provision for income taxes	$	2,592	$	13,211	$	321	$	(8,857	)	$	7,267

- Definition

Tabular disclosure of the profit or loss and total assets for each reportable segment. An entity discloses certain information on each reportable segment if the amounts (a) are included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) are otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss.

+ References + Details

Stock-Based Compensation (Stock Option Activity) (Details) - USD ($) $ / shares in Units, $ in Thousands			6 Months Ended
	Jun. 30, 2012	Dec. 31, 2011	Jun. 30, 2012
Options, Outstanding [Roll Forward]
Outstanding, beginning of period			422,239
Granted			20,000
Exercised			7,500
Canceled/Forfeited			0
Outstanding, end of period	434,739	422,239	434,739
Exercisable, end of period	366,072		366,072
Options, Outstanding, Weighted Average Exercise Price [Roll Forward]
Outstanding, weighted average exercise price, beginning of period			$ 15.06
Granted, weighted average exercise price			14.89
Exercised, weighted average exercise price			7.66
Canceled/Forfeited, weighted average exercise price			0.00
Outstanding, weighted average exercise price, end of period	$ 15.18	$ 15.06	15.18
Exercisable, weighted average exercise price, end of period	$ 14.81		$ 14.81
Options, Weighted Average Remaining Contractual Term:
SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2	6 years 1 month 6 days	6 years 5 months 23 days
Granted, weighted average remaining contractual life (years)			8 years
SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2	6 years 1 month 6 days	6 years 5 months 23 days
Exercisable, weighted average remaining contractual life (years), end of period	5 years 7 months 28 days
Options, Intrinsic Value:
Outstanding, aggregate intrinsic value, beginning of period			$ 766
Outstanding, aggregate intrinsic value, end of period	$ 770	$ 766	770
Exercisable, aggregate intrinsic value, end of period	$ 770		$ 770
Stock Options
Options, Intrinsic Value:
Award vesting period			3 years

Stock-Based Compensation (Stock Options by Exercise Price Range) (Details)	6 Months Ended
	Jun. 30, 2012 $ / shares shares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options outstanding, shares \| shares	434,739
Options outstanding, weighted average remaining contractual life (years)	6 years 1 month 6 days
Options outstanding, weighted average exercise price	$ 15.18
Options exercisable, shares \| shares	366,072
Options exercisable, weighted average exercise price	$ 14.81
Range of exercise prices, lower limit	0.01
Range of exercise prices, upper limit	$ 20.48
Range of Exercise Prices: 0.01 - 5.58
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options outstanding, shares \| shares	5,000
Options outstanding, weighted average remaining contractual life (years)	1 year
Options outstanding, weighted average exercise price	$ 4.72
Options exercisable, shares \| shares	5,000
Options exercisable, weighted average exercise price	$ 4.72
Range of exercise prices, lower limit	0.01
Range of exercise prices, upper limit	$ 5.58
Range of Exercise Prices: 5.59 - 9.43
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options outstanding, shares \| shares	89,239
Options outstanding, weighted average remaining contractual life (years)	4 years 4 months 28 days
Options outstanding, weighted average exercise price	$ 8.62
Options exercisable, shares \| shares	89,239
Options exercisable, weighted average exercise price	$ 8.62
Range of exercise prices, lower limit	5.59
Range of exercise prices, upper limit	$ 9.43
Range of Exercise Prices: 9.44 - 15.60
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options outstanding, shares \| shares	85,000
Options outstanding, weighted average remaining contractual life (years)	6 years 3 months 26 days
Options outstanding, weighted average exercise price	$ 12.94
Options exercisable, shares \| shares	65,000
Options exercisable, weighted average exercise price	$ 12.34
Range of exercise prices, lower limit	9.44
Range of exercise prices, upper limit	$ 15.60
Range of Exercise Prices: 15.61 - 20.48
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options outstanding, shares \| shares	255,500
Options outstanding, weighted average remaining contractual life (years)	6 years 8 months 16 days
Options outstanding, weighted average exercise price	$ 18.42
Options exercisable, shares \| shares	206,833
Options exercisable, weighted average exercise price	$ 18.50
Range of exercise prices, lower limit	15.61
Range of exercise prices, upper limit	$ 20.48

Stock-Based Compensation (Summary of Unvested Stock Options) (Details)	6 Months Ended
	Jun. 30, 2012 USD ($) $ / shares shares	Jun. 30, 2011 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost related to stock options \| $	$ 474,715
Employee Service Share-based Compensation, Nonvested Awards, Stock Options, Outstanding [Roll Forward]
Unvested, beginning of period \| shares	78,666
Granted \| shares	20,000
Vested \| shares	(29,999)
Unvested, end of period \| shares	68,667
Employee Service Share-based Compensation, Nonvested Awards, Stock Options, Weighted Average Grant Date Fair Value [Roll Forward]
Unvested, weighted average grant date fair value, beginning of period \| $ / shares	8.82
Granted, weighted average exercise price \| $ / shares	$ 14.89
Vested, weighted average grant date fair value \| $ / shares	7.99
Unvested, weighted average grant date fair value, end of period \| $ / shares	10.95
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost related to stock options, weighted average period for recognition	1 year 9 months 7 days
Share-based compensation expense \| $	$ 214,083	$ 234,150

Stock-Based Compensation (Restricted Stock) (Details)			3 Months Ended	6 Months Ended
Stock-Based Compensation (Restricted Stock) (Details)	Mar. 28, 2012 shares	Jan. 25, 2012 officer shares	Mar. 31, 2012 USD ($)	Jun. 30, 2012 USD ($)
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense \| $			$ 215,868	$ 471,629
Total unrecognized compensation expenses \| $				$ 953,385
Executive Officer
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of executive officers receiving awards \| officer		3
Executive Officer \| Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted		70,000
Chief Executive Officer \| Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period		1 year
Chief Executive Officer \| Employment Agreement \| Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted		30,000
Chief Executive Officer \| Employment Performance Review [Member] \| Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted		20,000
Other Executive Officer
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of executive officers receiving awards \| officer		2
Other Executive Officer \| Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percent of award which vests annually		33.33%
Other Executive Officer 1 \| Employment Performance Review [Member] \| Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted		10,000
Chief Executive Officer 2 \| Employment Performance Review [Member] \| Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted		10,000
Director \| Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted	12,500

Inventory (Details) - USD ($)	Jun. 30, 2012	Dec. 31, 2011
Inventory Disclosure [Abstract]
Raw materials	$ 19,108,000	$ 20,364,000
Work in process	7,621,000	6,601,000
Inventory, Net	26,729,000	26,965,000
Allowance for inventory obsolescence	$ 770,808	$ 485,680

- Definition

The amount of the valuation account as of the balance sheet date which reduces the carrying amount of inventory to net realizable value; takes into consideration such factors as market value, excessive quantities based on expected sales, technological obsolescence, and shrinkage. May also provide for estimated product returns or price concessions pertaining to product cost.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 330
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SAB TOPIC 5.BB)
-URI http://asc.fasb.org/extlink&oid=6386940&loc=d3e100047-122729

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.6(a))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 4
-Subparagraph (SX 210.12-09)
-URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e24092-122690

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 330
-SubTopic 10
-Section 35
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6386567&loc=d3e3927-108312

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 43
-Paragraph 14
-Chapter 4
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 43
-Paragraph 8, 9, 14
-Chapter 4
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 43
-Section A
-Paragraph 9
-Chapter 3
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 09
-Article 12

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 6
-Subparagraph a
-Article 5

+ Details

Credit Facility (Details) - Revolving Credit Facility	6 Months Ended
Credit Facility (Details) - Revolving Credit Facility	Jun. 30, 2012 USD ($) loan	Dec. 31, 2011 USD ($)	Dec. 31, 2010 USD ($)
Line of Credit Facility [Line Items]
Maximum borrowing capacity		$ 50,000,000	$ 40,000,000
Potential increase in borrowing capacity	$ 20,000,000
Borrowing base, component, % of eligible accounts receivable	80.00%
Borrowing base, component, % of eligible inventory	50.00%
Borrowing base, allowable share of total commitment amount attributable to inventory component	50.00%
Borrowing base, component, % of eligible equipment inventory	75.00%
Borrowing base amount available	$ 28,900,000	$ 30,000,000	$ 20,000,000
Amount outstanding	$ 1,000,000
LIBOR-based Rate
Line of Credit Facility [Line Items]
Variable rate, applicable margin	1.50%
CB Floating Rate
Line of Credit Facility [Line Items]
Variable rate, applicable margin	1.25%
Maximum
Line of Credit Facility [Line Items]
Maximum leverage ratio allowed	2.50
Default trigger, certain defaults of other company indebtedness, amount	$ 50,000
Default trigger, rendering of certain judgments, amount	$ 150,000
Maximum \| LIBOR-based Rate
Line of Credit Facility [Line Items]
Reference rate, number of allowable LIBOR-based borrowings outstanding \| loan	3
Minimum
Line of Credit Facility [Line Items]
Minimum commitment coverage ratio allowed	2

Other Long-term Liabilities (Details) - USD ($)	Jul. 30, 2008	Jun. 30, 2012
Other Liabilities [Line Items]
Deferred revenue, noncurrent, related to certain staffing requirements		$ 275,000
Paint and Coatings
Other Liabilities [Line Items]
Long-term purchase commitment, amount	$ 4,800,000
Cash received from supplier as discount toward future purchases	300,000
Liability related to deferred discount	$ 300,000	$ 238,084

- Definition

The noncurrent portion of deferred revenue amount as of balance sheet date. Deferred revenue is a liability related to a revenue producing activity for which revenue has not yet been recognized, and is not expected to be recognized in the next twelve months. Generally, an entity records deferred revenue when it receives consideration from a customer before achieving certain criteria that must be met for revenue to be recognized in conformity with GAAP.

+ References + Details

Earnings per Share (Basic and Diluted) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Numerator:
Net income	$ 3,000	$ 2,008	$ 6,508	$ 4,505
Denominator for basic net income per common share:
Weighted average common shares outstanding	12,216	12,179	12,177	12,157
Denominator for diluted net income per share:
Weighted average common shares outstanding	12,216	12,179	12,177	12,157
Dilutive effect of stock options and restricted stock	100	109	97	108
Diluted weighted average shares	12,316	12,288	12,274	12,265
Earnings per common share:
Basic	$ 0.25	$ 0.16	$ 0.53	$ 0.37
Diluted	$ 0.24	$ 0.16	$ 0.53	$ 0.37

Earnings per Share (Antidilutive Securities) (Details) - shares	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
Stock Options
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of diluted earnings per share	0	59,680

- Definition

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Antidilution
-URI http://asc.fasb.org/extlink&oid=6505113

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Diluted Earnings Per Share
-URI http://asc.fasb.org/extlink&oid=6510752

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Contingent Stock Agreement
-URI http://asc.fasb.org/extlink&oid=6508534

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 128
-Paragraph 40
-Subparagraph c
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 128
-Paragraph 13, 14
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Emerging Issues Task Force (EITF)
-Number 07-4
-Paragraph 4
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 128
-Paragraph 171
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
Segment Information (Details) - USD ($) $ in Thousands	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Segment Reporting Information [Line Items]
Revenue	$ 24,508	$ 13,758	$ 50,884	$ 28,812
Operating costs and expenses	19,679	10,536	40,433	22,261
Other income (expense)	58	17	94	716
Income before provision for income taxes	4,887	3,239	10,545	7,267
Sales
Segment Reporting Information [Line Items]
Revenue		1,901	23,080	5,778
Operating costs and expenses		638	17,118	3,186
Other income (expense)	0	0	0	0
Income before provision for income taxes	3,086	1,263	5,962	2,592
Rental
Segment Reporting Information [Line Items]
Revenue		11,601	27,409	22,482
Operating costs and expenses		4,909	11,383	9,271
Other income (expense)	0	0	0	0
Income before provision for income taxes	7,797	6,692	16,026	13,211
Service & Maintenance
Segment Reporting Information [Line Items]
Revenue		256	395	552
Operating costs and expenses		93	191	231
Other income (expense)	0	0	0	0
Income before provision for income taxes	90	163	204	321
Corporate
Segment Reporting Information [Line Items]
Revenue	0	0	0	0
Operating costs and expenses	6,144	4,896	11,741	9,573
Other income (expense)		17	94	716
Income before provision for income taxes	$ (6,086)	$ (4,879)	$ (11,647)	$ (8,857)